Comments (1)
schollz
commented on May 18, 2024
Thanks. I dumped the packets with
sudo tshark -r tshark-entrance.pcap -T fields -e frame.time_epoch -e wlan.sa -e wlan.ta -e wlan.ra -e wlan.da -e radiotap.dbm_antsignal
to get the sender, receiver, transmitter, and destination.
Some initial observations:
1. Broadcasts are great
Here are the signals being sent to ff:ff:ff... from your phone. They are ordered in time, but you can see just by inspection that they oscillate between two fairly similar numbers (reflecting going from cafe -> kidsroom -> cafe -> kidsroom -> cafe).
You can also see that the cafetv is different than entrance which is different from kidsroom, which is also great. That means that these broadcasts can be used to distinguish your phone.
cafetv 40:4e:36:0b:82:71-40:4e:36:0b:82:71-ff:ff:ff:ff:ff:ff-ff:ff:ff:ff:ff:ff [-41.0, -47.0, -45.0, -45.0, -65.0, -67.0, -43.0, -39.0, -43.0, -63.0, -63.0, -67.0, -65.0, -65.0, -71.0, -39.0, -45.0, -45.0, -41.0]
entrance 40:4e:36:0b:82:71-40:4e:36:0b:82:71-ff:ff:ff:ff:ff:ff-ff:ff:ff:ff:ff:ff [-37.0, -41.0, -41.0, -43.0, -47.0, -47.0, -63.0, -43.0, -45.0, -39.0, -41.0, -53.0, -59.0, -63.0, -61.0, -57.0, -59.0, -59.0, -31.0, -37.0, -39.0, -41.0]
kidsroom 40:4e:36:0b:82:71-40:4e:36:0b:82:71-ff:ff:ff:ff:ff:ff-ff:ff:ff:ff:ff:ff [-63.0, -67.0, -67.0, -45.0, -45.0, -47.0, -45.0, -63.0, -65.0, -61.0, -69.0, -69.0, -41.0, -39.0, -39.0, -41.0, -37.0, -39.0, -41.0, -51.0, -63.0, -65.0]
2. Other packets are not good
Here's an example of another packet (sent by f2:9f... to your phone):
cafetv f2:9f:c2:7d:68:9c-f2:9f:c2:7d:68:9c-40:4e:36:0b:82:71-40:4e:36:0b:82:71 [-49.0, -49.0, -49.0, -49.0, -49.0, -49.0, -49.0, -49.0, -49.0, -51.0, -49.0, -47.0, -49.0, -51.0, -49.0, -49.0, -49.0, -47.0, -49.0]
entrance f2:9f:c2:7d:68:9c-f2:9f:c2:7d:68:9c-40:4e:36:0b:82:71-40:4e:36:0b:82:71 [-57.0, -57.0, -73.0, -57.0, -57.0, -57.0, -57.0, -57.0, -55.0, -57.0, -57.0, -57.0, -57.0, -57.0, -57.0, -57.0, -57.0, -57.0, -57.0, -57.0, -57.0, -65.0, -57.0]
kidsroom f2:9f:c2:7d:68:9c-f2:9f:c2:7d:68:9c-40:4e:36:0b:82:71-40:4e:36:0b:82:71 [-55.0, -59.0, -53.0, -59.0, -61.0, -61.0, -61.0, -61.0, -61.0, -59.0, -61.0, -59.0, -61.0, -61.0, -53.0, -61.0, -59.0, -59.0, -61.0]
You can see that the values are always the same despite you moving from place to place. Thererfore these signals do not reflect your current position.
Unfortunately, this is the case with all the other packets. Here's another example (b0:39... to your phone):
cafetv b0:39:56:c3:76:3e-b0:39:56:c3:76:3e-40:4e:36:0b:82:71-40:4e:36:0b:82:71 [-67.0, -67.0, -69.0, -67.0, -67.0, -67.0, -67.0, -67.0, -69.0, -67.0, -65.0, -65.0, -69.0, -69.0, -67.0, -65.0, -67.0, -67.0, -67.0]
entrance b0:39:56:c3:76:3e-b0:39:56:c3:76:3e-40:4e:36:0b:82:71-40:4e:36:0b:82:71 [-65.0, -73.0, -73.0, -73.0, -71.0, -71.0, -73.0, -73.0, -73.0, -71.0, -73.0, -69.0, -73.0, -73.0, -73.0, -71.0, -73.0, -71.0, -73.0, -73.0, -71.0]
kidsroom b0:39:56:c3:76:3e-b0:39:56:c3:76:3e-40:4e:36:0b:82:71-40:4e:36:0b:82:71 [-73.0, -73.0, -73.0, -75.0, -73.0, -73.0, -73.0, -71.0, -73.0, -71.0, -73.0, -75.0, -73.0, -73.0, -77.0, -73.0, -73.0, -71.0, -73.0]
The values are always the same, even though you are changing places.
The only packets sent from your device are broadcast packets
If you look through the output of the attached script you'll see that only broadcasts are sent from your device. This is probably why it doesn't work for other packets, as they are sent from other devices and are static.
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